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Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.
- a)Rs.10
- b)Rs14
- c)Rs 7
- d)Rs12
- e)None
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Nine students of a class contribute a certain sum. Seven of them give ...
Average = sum/n
Average of 9 students = x
n = 9
x = sum/9
Seven of them give Rs. 5 = 7 * 5 = 35
35+(5+x)+(9+x) ∴ other two give Rs. 5 and Rs. 9 more than the average contribution
x = 35+(5+x)+(9+x)/9
x = 49+2x/9
9x = 49 + 2x
9x - 2x = 49
7x = 49
x = 7
Most Upvoted Answer
Nine students of a class contribute a certain sum. Seven of them give ...
let average contribution is x 8th boy gave=x+5 9th boy gave=x+9 average contribution =(5+5+5+5+5+5+5+x+5+x+9)÷9 hence (5+5+5+5+5+5+5+x+5+x+9)÷9=x x=7
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Community Answer
Nine students of a class contribute a certain sum. Seven of them give ...
Given:
- Seven students gave Rs. 5 each.
- Two students gave Rs. 5 more than the average contribution of all 9 students.
To find:
- The average contribution of the class of 9 students.
Solution:
Let's assume the average contribution of all 9 students is 'x'.
Total contribution of seven students = 7 × 5 = 35
Total contribution of two students = 2 × (x + 5)
Total contribution of all 9 students = 35 + 2(x + 5)
The average contribution of all 9 students can be calculated as:
(x1 + x2 + x3 + x4 + x5 + x6 + x7 + (x8 + 5) + (x9 + 5))/9 = (7x + 2x + 70)/9 = (9x + 70)/9
We know that the average contribution of all 9 students is 'x', so we can equate the above equation to 'x' and solve for it:
(9x + 70)/9 = x
9x + 70 = 9x
70 = 9x - 9x
70 = 0
This is not possible, so there must be an error in the question. However, if we assume that the two students gave Rs. 5 less than the average contribution of all 9 students, then we can solve for the average contribution:
Total contribution of two students = 2 × (x - 5)
Total contribution of all 9 students = 35 + 2(x - 5)
The average contribution of all 9 students can be calculated as:
(x1 + x2 + x3 + x4 + x5 + x6 + x7 + (x8 - 5) + (x9 - 5))/9 = (7x + 2x - 20)/9 = (9x - 20)/9
We know that the average contribution of all 9 students is 'x', so we can equate the above equation to 'x' and solve for it:
(9x - 20)/9 = x
9x - 20 = 9x
-20 = 0
This is not possible either, so there seems to be an error in the question. However, if we assume that the contribution of the two students is Rs. 9 more than the average contribution of all 9 students, then we can solve for the average contribution:
Total contribution of two students = 2 × (x + 9)
Total contribution of all 9 students = 35 + 2(x + 9)
The average contribution of all 9 students can be calculated as:
(x1 + x2 + x3 + x4 + x5 + x6 + x7 + (x8 + 9) + (x9 + 9))/9 = (7x + 2x + 18)/9 = (9x + 18)/9
We know that the average contribution of all 9 students is 'x', so we can equate the above equation to 'x' and solve for it:
(9x + 18)/9 = x
9x + 18 = 9x
18 = 0
This is not possible either, so there seems to be an error in the question
- Seven students gave Rs. 5 each.
- Two students gave Rs. 5 more than the average contribution of all 9 students.
To find:
- The average contribution of the class of 9 students.
Solution:
Let's assume the average contribution of all 9 students is 'x'.
Total contribution of seven students = 7 × 5 = 35
Total contribution of two students = 2 × (x + 5)
Total contribution of all 9 students = 35 + 2(x + 5)
The average contribution of all 9 students can be calculated as:
(x1 + x2 + x3 + x4 + x5 + x6 + x7 + (x8 + 5) + (x9 + 5))/9 = (7x + 2x + 70)/9 = (9x + 70)/9
We know that the average contribution of all 9 students is 'x', so we can equate the above equation to 'x' and solve for it:
(9x + 70)/9 = x
9x + 70 = 9x
70 = 9x - 9x
70 = 0
This is not possible, so there must be an error in the question. However, if we assume that the two students gave Rs. 5 less than the average contribution of all 9 students, then we can solve for the average contribution:
Total contribution of two students = 2 × (x - 5)
Total contribution of all 9 students = 35 + 2(x - 5)
The average contribution of all 9 students can be calculated as:
(x1 + x2 + x3 + x4 + x5 + x6 + x7 + (x8 - 5) + (x9 - 5))/9 = (7x + 2x - 20)/9 = (9x - 20)/9
We know that the average contribution of all 9 students is 'x', so we can equate the above equation to 'x' and solve for it:
(9x - 20)/9 = x
9x - 20 = 9x
-20 = 0
This is not possible either, so there seems to be an error in the question. However, if we assume that the contribution of the two students is Rs. 9 more than the average contribution of all 9 students, then we can solve for the average contribution:
Total contribution of two students = 2 × (x + 9)
Total contribution of all 9 students = 35 + 2(x + 9)
The average contribution of all 9 students can be calculated as:
(x1 + x2 + x3 + x4 + x5 + x6 + x7 + (x8 + 9) + (x9 + 9))/9 = (7x + 2x + 18)/9 = (9x + 18)/9
We know that the average contribution of all 9 students is 'x', so we can equate the above equation to 'x' and solve for it:
(9x + 18)/9 = x
9x + 18 = 9x
18 = 0
This is not possible either, so there seems to be an error in the question
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Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer?
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Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer? for Quant 2025 is part of Quant preparation. The Question and answers have been prepared according to the Quant exam syllabus. Information about Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Quant 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer?.
Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer? for Quant 2025 is part of Quant preparation. The Question and answers have been prepared according to the Quant exam syllabus. Information about Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Quant 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Nine students of a class contribute a certain sum. Seven of them give Rs. 5 each and the other two give Rs. 5 & 9 more then the average contribution of all the 9 students. The average contribution of the class of 9 students is.a)Rs.10b)Rs14c)Rs 7d)Rs12e)NoneCorrect answer is option 'C'. Can you explain this answer?.
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